Had the same problem on my venture as you have with the same broken piece on the sway bar and it would rattle over bumps. Did the same thing as one of the earlier posts and MIG welded mine back on and all around the split and has been fine ever since. But for ultimate repair the solid sway bar was the best way to go, I was just cheap and didn't want to invest the cash. In the old days sway bars where solid none of this hollow pipe crapy stuff, any way good stuff glad you fixed it.